Grate bar



H. K. EILERS GRATE BAR Dec. 4; 1928.

Filed March 16, 1927 ATTDRNEY Patented Dec. 4, i928.

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HENRY K. EILERS, OF'PLAINFIELID, NEW JERSEY, ASSIGNOR TO PYRAMID I303. PRODUCTS CORPORATION, A CGRPOB-ATION OF NEW YORK.

GRATE BAR.

Application filed. March 16, 1927.

The invention relates more particularly to an improved gratebar to be used in the fire boxes of boilers, furnaces and the like, to facilitate the use of small sizes of anthracite coal or line bituminous coal so as to obtain satisfactory and efficient results therefrom, thereby reducing the cost of operation.

Grate bars of various kinds for the use of this'type of coal have been in use for some time, but such grate bars, in some cases, have beenprovided with a plurality of separated caps, cast integral with the body of the bar, and located over single vertical air passages, opening respectively through a plurality of horizontal air passages into grooves or chair nels surrounding the individual caps covering the respective vertical air passages. In grate bars of this type, it frequently happens, in practice, that any irregular expansion or contraction of the caps or grate bars is liable to crack the individual caps or the integral supporting members holding the caps to the body portion of the bar. lVhen this occurs, the caps,.so affected, may be destroyed or entirely broken away, thereby decreasing; the usefulness of the grate bar, and ultimately requiring replacement, either of the caps or the entire bar.

An improved grate bar With more rigid connections between the caps and the body of the grate bar, but wherein single caps cover only a single vertical air passage is shown in the Eiler et al. Patent No. 1,585,967 of May 25, 1926, and the present grate bar is an improvement thereon. The primary object in my present improvement, as hereinafter described,'is to provide a grate bar with a more rigid construction, wherein continuous elongated caps, spaced apart laterally, are adapted to provide continuous longitudinal chan nels or passages therebetween. Separated vertical air passages under each flange of the elongated caps communicate by lateral or horizontal passages with the respective continuous channels between the caps, the entire structure being braced in both directions by a plurality of longitudinal ribs and transverse partitions. As pointed out later, these ribs and partitions are adapted to define and separate the vertical-horizontal air passages leading to the continuous channels or passages between the elongated caps.

A further object, therefore, is to provide a plurality of vertical air passages, separated tical passages,

Serial 1W0 175,767.

by longitudinal ribs, which are provided with lateral flanges along their upper edges, givingthem a Tshape in cross section, the "fshaped ribs being located on two levels, such that the lateral flanges or T-hea'ds of the ribs on the upper level, which form the caps, over lap or extend beyond the edges of the T- flanges on the ribs of the lower level, the respec tive flanges on the two levels being spaced vertically, so as to providehorizontal or lateral passages leading from the respective ver- (one on each side of the mid rib or stem of the T) under the caps to the continuous passages therebetween. By this construction, it will be seen that each vertical passage is provided with but a single lateral passage opening into the continuous passage between the caps.

A further object is to provide a plurality of transverse integral partitions for rigidly bracing the longitudinal ribs and the flanges forming the caps on the upper level, so that there .is little possibility of the caps being cracked or broken away by unequal heat conditions during combustion, or unequal expansion and contraction of the grate bars. Obviously, such a construction lends itself to the formation of a plurality of vertical air passages separated by the partitions and the longitudinal ribs, there being two series of such vertical-horizontal air passages under-the caps, opening respectively into the continuous channels or air passages on opposite sides of the caps, thereby overcoming objections, which might be raised to the use of a single vertical passage for supplying air through a plurality of lateral openings under individual caps.

One form and adaptation of my in'iproved grate bar is shown in the accompanying drawings, in which Fig. 1 shows a top plan View of the grate bar; Fig. 2 represents a vertical longitudinal section of the grate bar on the line 22 of Fig. 4 and along an irregular line 2-2 of Fig. 3; 3 shows a plan view of the underside of the grate bar and Fig. l is a transverse section on the line 4*ato'f Fig. 2.

Referring to the drawings, it will be seen that, in the present instance, my improved grate bar comprises a body portion 1 of elongated rectangular shape, preferably provided with depending lugs 2, at each side thereof, for supporting the individual grate bar sections in position in the lire box; of a furnace or boiler. It is preferable to use a plurality of sections, like those shown in Fig. 1 and when so used, adjoining sections may be made to overlap by providing the individual grate bars with a flange 3, upon which the end .4; ot the adjoining grate bar may rest.

In my improved grate bar, a plurality ot parallel ribs l and 5 are cast integrally with and extend longitudinally of the body 1, the ribs being previded with oiitwardly projectfliiiiges along their upper edges, so that the cross section is substantially "if-shaped, as shown in Fig. eh The longitudinal ribs t and 5 are arranged on two levels, as shown in Fig. a, particularly as to the T headsor lateral flanges along their upper edges. The ribs l, with on the upper level, are provided with sligl'itly wider T-flanges 6, which are preferably flattened on top and form elongated caps, as shown in Figs. 1 and .4. The T-shaped ribs at alternate with i the ribs 5 and are spaced "from each other to provide continuous longitudinal channels or passages 7 therebetween. The bottoms of the channels or long narrow air passages between the caps 6 are formed and determined by the flanges 8 ot the T-heads on the ribs 5, on the lower level.

The ribs t and 5 are spaced from each otherilaterally, so as to provide vertical air passages 9 on each side or the ribs 4: which extend along the middle of the caps f6, The T-shaped ribs l and 5, being on different levels, as previously pointed out, are also spaced apart vertically, so as to provide transverse or horizontal passages 10, as continuatio'n's of the vertical passages 9, the horizontal passages c oiiimuni'cating with the continuous longitudinal channels or pass'ages' 7, as w'u' be seen in Fig. l. It will thus beseen th ajt air entering the vertical passages 9' will pass upward tlierethrough and then laterally through the horizontal or transverse passages 10, into the channels 7, which lie between the caps G, over which the coal is adapted to be spread, the long narrow channels 7 giving theair access to the coal fofeflicient combustion thereof.

To facilitate the passage of the air from below the grate bar, into the channels 7 between the caps 6, the T-tiange's 11 of the ribs on the lower level are preferably beveled on th eir upper tacesat 12, so as. to slopein opposite directions from the middle and thereby deflect and :taeilitate the passage of air. Also, in order to eliminatedea-d ir pockets and further strengthen the caps 6, the corners 18 between the vertical. and horizontal portionsot the -shape ribs l are rounded, as will be'seen in F1 4-.

It has been previotdy pointed out that the caps in grate bars provided 'ith air passages underiiidividual caps, and intended for use with small sizes or fine coals, are liable to become broken away or tracked, therefore, it will be understood that, in the present instance, the caps 6 are materially strengthened by being formed as continuous longitudinal caps, extending from end to end or the grate bar section, and these caps are still further strengthened by being provided with ribs 4, as a part thereof, extending throughout the lefigth ot the caps along the middle of the underside, and uniting them with the body'p'ortioh'l. I V

Inord'er to still further treilgthen' the grate bar construction, the i" 4 and 5 are preferably connected by atplural'ity of transg0 verse partitioiis 14, which, in the present in-' stance, are uniformly spaced apart, longi tudinally' of the ribs 4 5',si ibsta'ntially as indicated in F 8. The transverse partiti'ons I4, as will seeiimore'particularlyiii Fig. 4, dividejthe vertical hbrizontal air passages 910 into pluralityjot airpassages entering the eoi'itinuouis chaiinelsfloi" ai'r passages 7 betweenthe capsh. It will be observed that the tra "x ei'se partitions; H'do not extend across the longitudinal channels 7, between the cap'sh, thereby leaving this channel continuoi' aspire v'io'us'ly indicated. Preferably, the si e v'al'ls ot the continuous longitudinal channels 7, are beveled orflared outwardly, as win he seeni'n Figs; 1 andl,

to facilitate the entrance of air into the fine coal that ma'y be's 'ireal'l over'tlfi'e' caps of the grate'bar. As shownat 1 5 minit will be seen that alternate ribs 5 are} fer-ably made wider or extend below the other ribs,

in orderto further strengthen and brace the grate bar. I

By the construction shown, it will be seen that the vertical-li'oriZontal' 'air passages 9l0, under thejr'espeetive elongated caps G are completely separated by the mid-rib a, so that there can be no coirti "tot air'u'nder the caps. In that two separate as ages are provided, the air eiiter the c l or air pa sages? between he caps, comes from below the grate bar, passes through individual airpassages 9'-l0, which, as previously pointed out, arepreterably divided into a plurality of passages by the transverse partitions 14:. Furthermore, it will be understood that, in providing the caps 6 with the ribs 4, depending from the middle thereof, and connecting these by the transverse partitions 141, which are cast integral with the caps 6 and with the ribs 5, as shown in Fig; 4, a particularly rigid construction is provided. Therefore, the caps may be subjected to considerable abuse, in the way of extremes of variable temperatures 12 without the capsbr grate bars becoming seri-\ ular importance;

The operation of my improved grate bar is comparatively simple and should be readily understood from the description given. It will be understood that when the fine coal is spread over the caps 6, a portion thereof will bridge and partially fill the channels 7 therebetween, and the air coming. up through the tudinal caps 6 may beformed of any length desired, and while, for the purpose of illustration, only four such caps are represented,

it will be understood that any desired or re quired number maybe provided. Furthermore, it will be understood that while I have shown only one form and arrangement of my improved grate bar, I do not wish to be limited to the specific details of construction shown and described, for these may be varied according to requirements, without departing from the spirit and scope of the invention.

1 claim 1. A grate bar section, comprising a rectangular frame cast integral with a plurality of relatively long parallel ribs, spaced from each other laterally to form continuous channels therebetween, said ribs being T-shaped in cross section, the flanges of adJa-cent ribs being on different levels and arranged so that the flanges of the ribs on the upper level extend beyond the edges of the flanges of the ribs on the lower level and over the sides of said frame but are spaced therefrom, so as to provide vertically then horizontally extending air passages therebetween, and lugs on the sides of said frame for supporting the individual grate bar section.

2. The grate bar section as claimed in claim 1, in which transverse partitions in spaced relation longitudinally of said T-ribs connect said ribs and the sides of said frames and are adapted to divide said vertical-horizontal air passage into a plurality of separate tubular passages.

3. A grate bar section, comprisinga rectangular body portion cast integrally with a plurality of laterally spaced parallel ribs of T-shaped cross-section extending the length of said body portion and arranged on two levels, alternate ribs being on the .upper level and provided with lateral flanges, forming elongated caps overlapping the ribs on the lower level, the sides of said body portion serving as boundary ribs on the lower level, and a plurality of transverse partitions cast integral with said ribs and the sides of sald body portion 1n spaced relation longitudinally thereof to form a plurality of tubular air passages under said caps and between said ribs, said transverse partitionsnot extending across the opening between the lateral flanges on the upper level ribs, thereby leaving continuous longitudinal channels there between.

4. The grate bar section as claimed in claim 3, in which the ribs alternating with said cap ribs and located on the lower level are provided with lateral flanges, the upper surfaces of which incline downward from and on each side of the middle of the ribs.

5. A grate bar section comprising a rectangular body portion cast integrally with a plurality of T-shaped parallel ribs arranged on two levels, the sides of said frame serving as boundary ribs on the lower level, said ribs being spaced apart laterally to form vertical air passages therebetween, the T-head lateral flanges on the upper level being adapted to form caps overlapping the flanges of the lower level ribs, including said side frame boundary ribs, but spaced vertically therefrom the leave lateral passages continuous with said vertical passages, said cap flanges being spaced apart laterally to leave continuous unobstructed longitudinal channels therebetween into which said vertical-lateral passages enter.

6. The grate bar section as claimed in claim 5, in which said vertical-lateral passages are divided by a plurality of transverse partitions extending between said ribs and the sides of said frame to form separate tubular passages leading into the continuous longi tudinal flanges.

7. A grate bar section comprising a body portion of rectangular shape, cast integrally with a plurality of continuous caps extending longitudinally thereof and spaced apart transversely to form upwardly opening continuous channels therebetween, and a plurality of tubular air passages formed below said caps extending vertically then horizontally and opening laterally into the respective continuous channels between said caps, said tubular air passages being defined by ribs below said caps, and transverse partitions between said ribs and the sides of said body portion.

8., The grate bar section as claimed in claim 7, in which the bottoms of said continuous channels between the caps slope in opposite channels between said T-shaped cap directions from the middle of the respective HENRY K. EILERQQ 

